For grounded control circuits, you may use a green (with or without one or more yellow stripes) or a bare conductor to connect the transformer terminal to a grounding terminal on the control panel.
You must totally enclose conductors and their connection external to the control panel enclosure in suitable raceways or enclosures. Unless used for flexible connections involving small or infrequent movements, or connections to normally stationary motors, limit switches and other externally mounted devices, fittings used with raceways or multiconductor cables must be liquidtight.
D-42 - Engine Wiring Diagram Specialist
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